Lots of oil, but it can easily be defeated with a good strategy. Wide moat, hope you like digging. Lots of archers, use your own or be buried in flaming arrows. Catapults available, but can you even get in range? Five-layer thick walls.
Strong map across the board! I doubt you can beat this Castle in a straight out kamikaze attack. On my first attempt, I went slow, knocked down strategic points 1 by 1, and lost less than 25% of my troops - a number which could have been lower had I not forgotten that one last patch of pitch. I wasn't sure it was there, but the dirt made me suspicious. Then, when I went for the last big push, I didn't remember to conduct my anti-pitch maneuver til I saw the danged flames frying my men...lol
Oh well - whether I lost 15% or 75% the map made conduct my attack with caution.